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Nature of Ops and Sign. Acctg Policies (Details Textuals 2)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 18, 2020
$ / Barrel
Mar. 31, 2021
USD ($)
$ / Barrel
Dec. 31, 2020
USD ($)
Sep. 18, 2020
USD ($)
Dec. 31, 2021
USD ($)
$ / Barrel
Dec. 31, 2020
USD ($)
$ / Barrel
Dec. 31, 2019
USD ($)
$ / Barrel
Property, Plant and Equipment [Line Items]              
Oil and Gas, Average Sale Price | $ / Barrel 40.08 36.40     63.86 35.84 55.55
Costs related to CO2 pipelines not placed into service         $ 22,400,000    
Amortization of intangible assets     $ 2,700,000 $ 1,700,000 9,100,000   $ 2,400,000
Ceiling test write-downs of oil and gas properties   $ 14,400,000 $ 1,006,000 996,658,000 $ 14,377,000   0
Number of reporting segments         1    
Impairments of unevaluated costs       $ 244,900,000     18,200,000
Impairment of long-lived assets         $ 0 $ 0 $ 0
Minimum              
Property, Plant and Equipment [Line Items]              
Useful life of intangible CO2 contracts         7 years    
Maximum              
Property, Plant and Equipment [Line Items]              
Useful life of intangible CO2 contracts         14 years    
Pipelines | Minimum              
Property, Plant and Equipment [Line Items]              
Useful life         20 years    
Pipelines | Maximum              
Property, Plant and Equipment [Line Items]              
Useful life         50 years    
Vehicles | Minimum              
Property, Plant and Equipment [Line Items]              
Useful life         1 year    
Vehicles | Maximum              
Property, Plant and Equipment [Line Items]              
Useful life         5 years    
Furniture and Fixtures | Minimum              
Property, Plant and Equipment [Line Items]              
Useful life         1 year    
Furniture and Fixtures | Maximum              
Property, Plant and Equipment [Line Items]              
Useful life         10 years    
Computer Equipment | Minimum              
Property, Plant and Equipment [Line Items]              
Useful life         1 year    
Computer Equipment | Maximum              
Property, Plant and Equipment [Line Items]              
Useful life         5 years